It’s hard to immediately say something is a red flag when you’ve only just started getting to know and dating each other. You should first take time to carefully observe her behavior.
For me, yes that’s a red flag because you’ve waited him for about 30 minutes on your date and keeps you waiting, but even then, there could still be a valid reason, maybe he got caught in traffic or his meeting ended late. The best thing is still to communicate with each other.
Don’t overthink or immediately look for red flags. Just assume that businessmen are often really busy. Keep checking in on him and try to make him smile to help ease his stress because he might already be stressed with his business while you’re already thinking something is wrong with him.